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aAlthough hecto, deka, deci, and centi are SI prefixes, their use should be avoided except for SI unit-multiples for area and volume and nontechnical use of centimeter, as for body and clothing measurement.

aAlthough hecto, deka, deci, and centi are SI prefixes, their use should be avoided except for SI unit-multiples for area and volume and nontechnical use of centimeter, as for body and clothing measurement.

For a complete description of SI and its use the reader is referred to ASTM E380.

A representative list of conversion factors from non-SI to SI units is presented herewith. Factors are given to four significant figures. Exact relationships are followed by a dagger. A more complete list is given in the latest editions of ASTM E380 and ANSI Z210.1.

tThe spellings "metre" and "litre" are preferred by ASTM; however, ''-er'' is used in the Encyclopedia. tWide use is made of Celsius temperature (t) defined by t = T - To where T is the thermodynamic temperature, expressed in kelvin, and T0 = 273.15 K by definition. A temperature interval may be expressed in degrees Celsius as well as in kelvin.

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